Voice Trainer, developed by Radboudumc, is a lifestyle app available for Android devices. Originally designed for people with Parkinson's disease who have difficulty speaking clearly, the app is also suitable for professional speakers and individuals with other speech disorders with the guidance of a speech therapist.

The app provides continuous visual feedback on the loudness and pitch of speech with a single dot on the screen, allowing users to see which aspect needs to be adjusted. The Voice Trainer can be used to practice speech technique independently or to check speech during a conversation. It is essential to work with a speech therapist to set optimal loudness and pitch.

Additionally, more features are available with the Voice Trainer Extension. Overall, the Voice Trainer is a helpful tool for individuals with speech disorders to improve their communication skills.